2000 MITSUBISHI MONTERO check engine

GDI -Troubleshooting 13A-152
NG
(2) NGCheck the following connector:
B - 111NG
Repair
OK
Measure at intermediate connector
B-110.
DUse test harness (MB991658) to
connect the connector, and
measure at the pick-up harness.
DEngine: Idling
DSelector lever position: P
(1) Voltage between terminal 4 and
earth
OK:
4.8 - 5.2 V
(2) Voltage between terminal 5 and
earth
OK:
0.3 - 4.7 V
(3) Voltage between terminal 6 and
earth
OK:
0.5 V or less(1), (3) NGCheck the following connector:
B - 111
OK
Check the following connector:
D-121NG
Repair
OK
Check the harness wire between the
fuel pressure sensor and the
intermediate connector.NG
Repair
From the previouspage
OK
Check the harness wire between the
intermediate connector and the
engine-A/T-ECU, and repair if
necessary.
OK
Check the harness wire between the
fuel pressure sensor and the
intermediate connector.NG
Repair
OK
Replace the fuel pressure sensor.
Check the trouble symptoms.
Check the following connector:
D-121NG
Repair
NG
Check the harness wire between the
intermediate connector and the
engine-A/T-ECU, and repair if
necessary.
OK
Measure at engine-A/T-ECU
connector D-121.
DMeasure the voltage at the
engine-A/T-ECU terminal.
DEngine: Idling
DSelector lever position: P
DVoltage between terminal 93 and
earth
OK:
0.3 - 4.7 VNGCheck the following connector:
D-121NG
Repair
OK
Check the harness wire between the
intermediate connector and the
engine-A/T-ECU, and repair if
necessary.
OKCheck the following connector:
D-121NG
Repair
OK
Check the trouble symptoms.
OK
Replace the engine-A/T-ECU.OKRepair


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GDI -Troubleshooting 13A-153
Code No.64 Alternator FR terminal systemProbable cause
Range of Check
DEngine speed: 50 r/min or more
Set Conditions
DInput voltage from the alternator FR terminal is system voltage for 20
seconds.DOpen circuit in alternator FR terminal circuit
DMalfunction of engine-A/T-ECU
OK
Check the harness wire between the
intermediate connector and the
engine-A/T-ECU, and repair if
necessary.NG
Repair
NG
Check the following connector:
D-120NG
Repair
Check the following connector:
B-41NG
Repair
OK
Measure at intermediate connector
B-41.
DUse test harness (MB991658) to
connect the connector, and
measure at the pick-up harness.
DEngine:idling (After warming up)
DSelector lever position: P
DRadiator fan: Not operating
DThe voltage between terminal 2
and earth
OK:
The voltage drops when
the Headlamp are turned
on.NG
Check the following connector:
B-59NG
Repair
OK
Check the trouble symptoms.
NG
Replace the engine-A/T-ECU.
OK
Check the harness wire between the
intermediate connector and the
engine-A/T-ECU.NG
Repair
OK
Measure at intermediate connector
B-41.
DUse test harness (MB991658) to
connect the connector, and
measure at the pick-up harness.
DIgnition switch: ON
DThe voltage between terminal 2
and earth
OK:
9 - 10 VNGMeasure at engine-A/T-ECU
connector D-120.
DMeasure the voltage at the
engine-A/T-ECU terminal.
DIgnition switch: ON
DThe voltage between terminal 54
and earth
OK:
9 - 10 VNGCheck the following connector:
D-120
OK
NG
Repair
OK
Check the following connector:
D-120NG
Replace
OK
Check the trouble symptoms.NGReplace the engine-A/T-ECU.
OK
Check the harness wire between the
intermediate connector and the
engine-A/T-ECU.NG
Repair
NG
Replace the alternator.OK
Check the trouble symptoms.OKIntermittent malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
Check the harness wire between the
alternator and the intermediate
connector.


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GDI -Troubleshooting 13A-154
Code No.77 Accelerator pedal position sensor (2nd
channel) systemProbable cause
Range of Check
DAcceleratorpedal positionsensor (1st channel) is normal.
DCommunication between the engine-A/T-ECU and the throttle valve controller
is normal.
Set Conditions
DOutput voltage of the accelerator pedal positionsensor (2nd channel) is 0.2
V or less for one second
or
DOutput voltage of the accelerator pedal positionsensor (1st channel) is 2.5 V
or less, and output voltage of the acceleratorpedal positionsensor (2nd
channel) is 4.5 V or more for one second.
or
DDifference between the accelerator pedal positionsensor (1st and 2nd
channels) output voltages exceeds 1.0 V (i.e. when the throttle valveopening
anglechanges slightly).DMalfunction of accelerator pedal positionsensor
(2nd channel)
DOpen or short circuit in acceleratorpedal position
sensor (2nd channel) circuit or loose connector
contact
DMalfunction of the throttle valve controller
DMalfunction of engine-A/T-ECU
OKIntermittent malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
NG
Check the acceleratorpedal position
sensor (Refer to P.13A-229.)NG
Replace
OK
Measure at accelerator pedal position
sensor connector D-135
DDisconnect the connector and
measure at the harness side.
(1) The resistance between terminal
7 and earth
OK:
2Wor less
(2) The voltage between terminal 8
and earth
(Ignition switch: ON)
OK:
4.8 - 5.2 V(1) NGCheck the following connector:
D-11NG
Repair
OK
Check the following connector:
D-45NG
Repair
Check the harness wire between
accelerator pedal positionsensor
(2nd channel) and the throttle valve
controller.NG
Repair
OK
Check the trouble symptoms.NGReplace the throttle valve controller.
(2) NGMeasure at throttle valve controller
connector D-11.
DMeasure voltage at the throttle
valve controller connector
terminals.
DIgnition switch: ON
DThe voltage between terminal 6
and earth
OK:
4.8 - 5.2 VOK
OK
Check the harness wire between
accelerator pedal positionsensor
(2nd channel) and the throttle valve
controller, and repair if necessary.NG
Repair
NG
Check the following connector:
D-11NG
Repair
OK
Check the harness wire between
accelerator pedal positionsensor
(2nd channel) and the throttle valve
controller.NG
Repair
OK
To the nextpage
OK
Check the trouble symptoms.NGReplace the throttle valve controller. OK
MUT-
IIData list
77 Acceleratorpedal positionsensor
(2nd channel) (Refer to P.
13A-198, DATA LIST
REFERENCE TABLE.)
Check the following connector:
D-11


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GDI -Troubleshooting 13A-156
Code No.78 Accelerator pedal position sensor (1st
channel) systemProbable cause
Range of Check
DAcceleratorpedal positionsensor (2nd channel) is normal.
DCommunication between the engine-A/T-ECU and the throttle valve controller
is normal.
Set Conditions
DThe output voltage of accelerator pedal positionsensor (1st channel) is 0.2 V
or less for one second.
or
DThe output voltage of accelerator pedal positionsensor (2nd channel) is 2.5
V or less, and that of acceleratorpedal positionsensor (1st channel) is 4.5
V or more for one second
or
DThe difference between accelerator pedal positionsensor (1st channel) and
accelerator pedal positionsensor (2nd channel) output voltages is 1.0 V or
more (i.e. the throttle opening anglechanges slightly).
or
DThe output voltage of accelerator pedal positionsensor (1st channel) is 1.1 V
or more for one second when the acceleratorpedal positionswitch is turned
on.DMalfunction of accelerator pedal positionsensor
(1st channel)
DOpen or short circuit in the acceleratorpedal
position sensor (1st channel) circuit or loose
connector contact
DAcceleratorpedal positionswitch seized ON
DMalfunction of throttle valve controller
DMalfunction of engine-A/T-ECU
OK
Check the harness wire between
accelerator pedal positionsensor
(1st channel) and the engine-
A/T-ECU, and repair if necessary.
NG
Check Acceleratorpedal position
sensor (1st channel) (Refer to
P.13A-229).NG
Replace
OK
Check the trouble symptoms.NGReplace the engine-A/T-ECU.
(2) NGMeasure at engine-A/T-ECU
connector D-120.
DMeasure the voltage at the
engine-A/T-ECU terminal.
DIgnition switch: ON
DVoltage between terminal 46 and
earth
OK:
4.8 - 5.2 VOK
OK
MUT-
IIData list
78 Acceleratorpedal positionsensor
(1st channel) (Refer to 13A-198,
DATA LIST REFERENCE
TABLE.)OKTransient malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
OK
Check the trouble symptoms.NGReplace the engine-A/T-ECU.
MUT-
IIData list
26 Acceleratorpedal positionswitch
(Refer to 13A-198, DATA LIST
REFERENCE TABLE.)NGCheck the acceleratorpedal position
switch system. (Refer to P.13A-192,
Inspection Procedure 28).
OK
Measure at accelerator pedal position
sensor connector D-135.
DDisconnect the connector and
measure at the harness side.
(1) Resistance between terminal 1
and earth
OK:
2Wor less
(2) Voltage between terminal 2 and
earth
(Ignition switch: ON)
OK:
4.8 - 5.2 V(1) NGCheck the following connector:
D-120NGRepair
NG
Repair
NG
Check the following connector:
D-117NG
Repair
OK
Check the following connector:
D-45NG
Repair
OK
Check the harness wire between
accelerator pedal positionsensor
(1st channel) and the engine-
A/T-ECU.NG
Repair
OK
Check the harness wire between
accelerator pedal positionsensor
(1st channel) and the engine-
A/T-ECU.NG
RepairOK
To the nextpage
Check the following connector:
D-120


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GDI -Troubleshooting 13A-157
OK
Measure at accelerator pedal position
sensor connector D-135.
DConnect connector terminals
No.1, No.2 and No.3 only by
using test harness (MB991658),
and measure at the pick-up
harness.
DIgnition switch: ON
(1) Voltage between terminal 1 and
earth
OK:
0.5 V or less
(2) Voltage between terminal 2 and
earth
OK:
4.8 - 5.2 V
(3) Voltage between terminal 3 and
earth
OK:
Acceleratorpedalfully re-
leased: 0.985 - 1.085 V
Acceleratorpedalfully de-
pressed: 4.0 V or higher(1), (2) NGCheck the following connector:
D-32NG
Check the following connector:
D-31NG
Repair OK
Check the harness wire between
accelerator pedal positionsensor
(1st channel) and the engine-
A/T-ECU, and repair if necessary.
From the previouspage
(3) NG
Adjust the acceleratorpedal position
sensor. (Refer to P.13A-221.)
OK
Check the harness wire between
accelerator pedal positionsensor
(1st channel) and the engine-
A/T-ECU, and repair if necessary.
OK
Measure at engine-A/T-ECU
connector D-121.
DMeasure the voltage at the
engine-A/T-ECU terminal.
DIgnition switch: ON
DVoltage between terminal 95 and
earth
OK:
Acceleratorpedalfully re-
leased: 0.985 - 1.085 V
Acceleratorpedalfully de-
pressed: 4.0 V or higherNGCheck the following connector:
D-121NGRepair
OK
Check the harness wire between
accelerator pedal positionsensor
(1st channel) and the engine-
A/T-ECU, and repair if necessary.
OKCheck the following connector:
D-121NG
OK
Check the trouble symptoms.
NG
Replace the engine-A/T-ECU.Repair
Repair


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GDI -Troubleshooting 13A-158
Code No.79 Throttle position sensor (1st channel)
systemProbable cause
The throttle valve controller judges a malfunction, and then transmit the result to
the engine-A/T-ECU.
Range of Check
DIgnition switch: ON
Set Conditions
DThe sensor output voltage is 0.2 V or less.
or
DThe sensor output voltage is 4.85 V or more and the throttle position sensor
(2nd channel) output voltage is 2.5V or more.
or
DThe throttle position sensor (1st channel) and throttle position sensor (2nd
channel) combination output voltage is outside 4 - 6V.
or
DThe opening angle of throttle positionsensor (1st channel) is different from
its target by 1V or more.
or
DThe throttle position sensor (1st channel) output changes within 25 mV when
the throttle valve control servo moves one step.DMalfunction of throttle position sensor
DOpen or short circuit in the throttle position sensor
(1st channel) circuit or loose connector contact
DMalfunction of throttle valve controller
DMalfunction of engine-A/T-ECU
OK
Check the harness wire between the
the throttle position sensor and the
throttle valve controller, and repair if
necessary.
MUT-
IIData list
79 Throttle position sensor (1st
channel) (Refer to P.13A-198,
DATA LIST REFERENCE
TABLE.)OKTransient malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
NG
Check the throttle position sensor.
(Refer to P.13A-228.)NG
Replace
OK
Measure at throttle position sensor
connector B-102.
DDisconnect the connector and
measure at the harness side.
(1) Voltage between terminal 1 and
earth
(Ignition switch: ON)
OK:
4.8 - 5.2 V
(2) Resistance between terminal 3
and earth
OK:
2Wor less(1) NGMeasure at throttle valve controller
connector D-11.
DMeasure voltage at the throttle
valve controller connector
terminals.
DIgnition switch: ON
DVoltage between terminal 6 and
earth
OK:
4.8 - 5.2 VOKCheck the following connector:
D-11
NG
Repair
NG
Check the following connector:
D-11NG
Repair
OK
Check the trouble symptoms.NGReplace the throttle valve controller.
NG
Check the following connector:
B-102NG
Repair
(2) NGCheck the following connector:
D-11NGRepair
OK
Check the harness wire between the
the throttle position sensor and the
throttle valve controller.NG
Repair
OK
Check the harness wire between the
the throttle position sensor and the
throttle valve controller.NG
Repair
OK
Check the trouble symptoms.NGReplace the throttle valve controller.
OK
To the nextpage


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GDI -Troubleshooting 13A-160
Code No.89 Abnormal fuel systemProbable cause
Range of Check
DEngine: Being learning the air - fuel ratio
Set Conditions
DTen seconds or more havebeenpassed while the fuel injection amount
compensation value is too low.
or
DTen seconds or more havebeenpassed while the fuel injection amount
compensation value is too high.DMalfunction of fuel supply system
DMalfunction of oxygen sensor
DMalfunction of intake air temperature sensor
DMalfunction of barometric pressure sensor
DMalfunction of air flow sensor
DMalfunction of engine-A/T-ECU
Repair
OK
MUT-
IIData list
74 Fuel pressure sensor (Refer to
13A-198, DATA LIST
REFERENCE TABLE.)NGCheck fuel leakage around the fuel
pump (high-pressure) line.NG
NO
Check the air intake from the intake
hose and right bank intake manifold.NG
Repair
OK
Check the oxygen sensor (Refer to
P.13A-230.)NG
Replace
MUT-
IISelf-Diag Code
Is any diagnosis code other than
No.89 output?YESRefer to P.13A-130, INSPECTION
CHART FOR DIAGNOSIS CODES.
OK
Check the exhaust gas leaks from
the right bank exhaust manifold.NG
Cleaning
OK
Check the throttle body (around the
throttle valve), and clean if
necessary. (Refer to P.13A-220).NG
Cleaning
OK
MUT-
IIData list
11 Oxygen sensor
12 Air flow sensor
13 Intake air temperature sensor
21 Engine coolant temperature
sensor
25 Barometric pressure sensor
(Refer to 13A-198, DATA LIST
REFERENCE TABLE.)
Reference
If all the service data is normal, go
to “OK.”
If any abnormal service is found, go
to “NG.”NGRefer to the Inspection procedure for
the sensor, which is indicated by the
abnormal service data.
(Refer to P.13A-130, INSPECTION
CHART FOR DIAGNOSIS CODES.)OK
Replace the fuel pump
(high-pressure).
Check the purge control solenoid
valve (Refer to GROUP 17 -
Emission Control).NG
Replace
OK
To the nextpage


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GDI -Troubleshooting GDI -Troubleshooting 13A-161
OK
Check the right bank injectors for
clogging or leaks.NG
Repair
OK
Check the right bank fuel lines for
fuel leaks.NG
Repair
OK
Check the fuel pressure between the
fuel pump(low-pressure) and the
fuel pump (high-pressure)(Refer to
P.13A-112).NG
From the previouspage
OK
Check the trouble symptoms.OKTransient malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
NG
Replace the engine-A/T-ECU.
OK
Check the EGR valve (Refer to
GROUP 17 - Emission Control).NG
Replace
Check the fuelline between the fuel
pump(low-pressure) and the fuel
pump (high-pressure)(Refer to
P.13A-222).
Code No.91 Electronic-controlled throttle valve systemProbable cause
Range of Check
DIgnition switch: ON
DError in communication between the engine-A/T-ECU and the throttle valve
controller
Set Conditions
DOutput voltage of throttle position sensor (2nd channel) fluctuates significantly
(approx. 1 V or more) from an expected value, based on that of the
accelerator pedal positionsensor (2nd channel).
Range of Check
DIgnition switch: ON
DError in communication between the throttle valve controller and the
engine-A/T-ECU
Set Conditions
DThe output voltage of the throttle position sensor (2nd channel) is significantly
different (approx. 1 V) from the the throttle valveopening angle (voltage),
which the engine-A/T-ECU request the throttle valve controller.DShort in communicationline
DMalfunction of the engine-A/T-ECU
DMalfunction of the throttle valve controller
OK
Check the harness wire between the throttle valve controller
and the engine-A/T-ECU.NG
Repair
NG
Replace the engine-A/T-ECU.
Check the following connectors:
D-11, D-119, D-122NG
Repair
OK
NG
Replace the throttle valve controller.
Check the trouble symptoms.
Check the trouble symptoms.


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